Sound Examples for Chapter 8: Automated Rhythm Analysis
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La Marseillaise (Marseillaise.mp3 0:09). The first four bars of the French National anthem.
[S:62]MIDI Beat Tracking with Oscillators: Michelle (Michelle-MIDIOsc.mp3 0:50). The "jazz" version jazz1_fast-rep_1.mid of the Beatles' Michelle from the MIDI collection is beat-tracked using an adaptive phase-reset oscillator. A burst of white noise is superimposed at each detected beat. See Sect. 8.2.1.
[S:63]MIDI Beat Tracking with Oscillators I (Maple-DrisceoilOsc.mp3), (Maple-RoacheOsc.mp3), and (Maple-TrachtmanOsc.mp3). Three MIDI versions of the Maple Leaf Rag by T. O. Drisceoil, J. Roache, and W. Trachtman are beat tracked using an adaptive wavetable oscillator. The detected beat locations are indicated by the superimposed stick sound. See Sect. 8.2.1.
[S:64]MIDI Beat Tracking with Oscillators II (Maple-MIDIOscSlow.mp3). Trachtman's version of the Maple Leaf Rag is beat tracked using an adaptive wavetable oscillator initialized near the eighth-note rate. The detected beat locations are indicated by the superimposed stick sound. See Sect. 8.2.1.
[S:65]Statistical MIDI Beat Tracking I (Maple-T-Stat.mp3) and (Maple-R-Stat.mp3). Two MIDI versions of the Maple Leaf Rag by Trachtman (indicated by T) and Roache (indicated by R) are beat tracked using the statistical approach of Sects. 7.5 and 8.2.2. The detected beat locations are indicated by the superimposed stick sound.
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Michelle-MIDIStat (Michelle-MIDIStat.mp3 0:50). A MIDI version of the Beatles' Michelle is beat tracked using the statistical approach. The detected beat locations are indicated by the superimposed stick sound. See Sect. 8.2.2.
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Statistical MIDI Beat Tracking II (Maple-T-StatSlow.mp3) and (Maple-R-StatSlow.mp3). Two MIDI versions of the Maple Leaf Rag by Trachtman and Roache are beat tracked using the statistical approach. The procedure is initialized near the eighth-note pulse. See Sect. 8.2.2.
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Statistical MIDI Beat Tracking III (Maple-T-VerySlow.mp3) and (Maple-T-Fast.mp3). The Maple Leaf Rag is beat tracked using the statistical approach. The procedure is initialized near the sixteenth-note tatum (fast) and near the 2/4 measure (very slow). Observe that the phase of the slow tracking is locked to the syncopated "and" rather than the "one."
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Three Against Two Polyrhythm (Poly32.mp3 0:15) The 3 vs 2 polyrhythm.
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Three Against Two Polyrhythm Accelerating (Poly32acc.mp3 0:15) The 3 vs 2 polyrhythm is slowly accelerated. .
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Audio Beat Tracking is demonstrated on 16 musical works by superimposing a burst of white noise at each detected beat. The excerpts are described in Table A.1 on p. pageref and discussed at length in Sect. 8.3.2.
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Howell's Delight II (Tap-Howell2.mp3 0:58). Audio beat tracking of the song by the Baltimore Consort . In this version, the initial value of the period T is doubled to [0.4, 0.8] and the method locates the 6/8 measure at about T = 0.72 sec. Observe how much musical activity occurs between each detected timepoint. Compare to (Tap-Howell2.mp3 0:58). See Sect. 8.3.2.
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Julie's WaltzII (Tap-Julie2.mp3 0:58). Audio beat tracking of Julie's Waltz. In this version, the initial value of the period T is doubled to [0.4, 0.8] and the method locates the quarter-note pulse at T approxinately 0.61 sec. instead of the eighth-note tatum at T approximately 0.30 as in (Tap-Julie.mp3 0:58). See Sect. 8.3.2.
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Ska Tap (Tap-SkaOn.mp3 0:44) and (Tap-SkaOff.mp3 0:44). Audio beat tracking of Lion Says by Prince Buster and the Ska . When the initial period T is doubled to [0.4, 0.8], the method can converge to either of two phases which correspond to the "on-" and the "off-" beat. Compare to (Tap-Ska.mp3 0:44) . See Sect. 8.3.2.
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Maple Tap [S: 3/2] (MapleTap3-2.mp3 0:44). Audio beat tracking of the Maple Leaf Rag with a tightly constrained initial period causes the algorithm to lock onto a 3:2 entrainment at T approxinately 0.52 instead of the actual pulse at T approxinately 0.34. Compare to (MapleTapRag.mp3 1:51). See Sect. 8.3.2.
